Public exploit available
Public proof-of-concept or exploit code exists (ExploitDB / Metasploit / Nuclei).

CVE-2009-1955

CWE-776 — XML Entity Expansion (Billion Laughs)12 documents9 sources
Severity
7.5HIGH
EPSS
2.3%
top 15.18%
CISA KEV
Not in KEV
Exploit
PoC available
Public exploit / PoC exists
Affected products
7
Apache Apr-utilApache Http ServerApple MAC OS X+4 more
Timeline
PublishedJun 8
Latest updateMay 2

Description

The expat XML parser in the apr_xml_* interface in xml/apr_xml.c in Apache APR-util before 1.3.7, as used in the mod_dav and mod_dav_svn modules in the Apache HTTP Server, allows remote attackers to cause a denial of service (memory consumption) via a crafted XML document containing a large number of nested entity references, as demonstrated by a PROPFIND request, a similar issue to CVE-2003-1564.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages5 packages

▶NVDapache/http_server2.2.0 — 2.2.12
▶NVDapache/apr-util< 1.3.7
▶Debianapr-util< 1.3.7+dfsg-1+3
▶NVDapple/mac_os_x< 10.6.2

Also affects: Debian Linux 4.0, Fedora 10, 11, 9, Ubuntu Linux 6.06, 8.04, 8.10, 9.04

Patches

Patch: marc.info ↗Patch: svn.apache.org ↗Patch: www.oracle.com ↗

🔴Vulnerability Details

3
GHSA
GHSA-hfr6-pxvf-frf7: The expat XML parser in the apr_xml_* interface in xml/apr_xml↗2022-05-02
▶
OSV
CVE-2009-1955: The expat XML parser in the apr_xml_* interface in xml/apr_xml↗2009-06-08
▶
CVEList
CVE-2009-1955: The expat XML parser in the apr_xml_* interface in xml/apr_xml↗2009-06-06
▶

💥Exploits & PoCs

1
Exploit-DB
Apache mod_dav / svn - Remote Denial of Service↗2009-06-01
▶

📋Vendor Advisories

5
Red Hat
httpd: Billion laughs attack regression↗2016-08-04
▶
Ubuntu
Apache vulnerabilities↗2009-06-11
▶
Ubuntu
apr-util vulnerabilities↗2009-06-10
▶
Red Hat
apr-util billion laughs attack↗2009-06-01
▶
Debian
CVE-2009-1955: apr-util - The expat XML parser in the apr_xml_* interface in xml/apr_xml.c in Apache APR-u...↗2009
▶

💬Community

2
Bugzilla
CVE-2016-6312 apr-util, httpd: Billion laughs attack regression↗2016-08-04
▶
Bugzilla
CVE-2009-1955 apr-util billion laughs attack↗2009-06-08
▶
CVE-2009-1955 (HIGH CVSS 7.5) | The expat XML parser in the apr_xml | cvebase.io